[Boater Sam]

Before you toss those valves away, try resoldering the ends of the pins. I have had several 6P25 that have appeared to be O/C heaters but were recovered. Similarly with the rectifier, they draw a fair 1.1amps heater current and are known to lose contact with the wire inside the cap.
KT61 is nearly a 6P25. Pin compatible.
You could always hide 2 silicon diodes and a 120 ohm resistor under the rectifier base if the UU6 is definitely duff.